基于SPR的液晶填充双D型PCF双参量传感器设计  

Liquid Crystal-Filled Double-D-Type PCF Dual-Parameter Sensor Based on SPR

作　　者：范振凯 孟俊皓 褚世超 Fan Zhenkai;Meng Junhao;Chu Shichao(School of Information Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China)

机构地区：[1]河北科技大学信息科学与工程学院,河北石家庄050018

出　　处：《光学学报》2024年第9期247-257,共11页Acta Optica Sinica

基　　金：河北科技大学人才引进科研启动项目(PYB2018016);河北省自然科学基金青年项目(A2020208005)。

摘　　要：提出了一种基于表面等离子体共振(SPR)原理的液晶填充的双D型光子晶体光纤(PCF)传感器,用于温度和折射率(RI)的双重检测。选用金作为金属对PCF中的两个大开环以及第二包层的4个气孔进行镀膜以激发SPR现象,实现了外部传感与内部传感的结合,并进一步增强了SPR效应。为了实现温度与RI的双重检测,将温敏材料液晶E7填入中央大气孔形成纤芯,进而提升温度传感性能,通过上下两侧的大开环与待测分析液的接触实现折射率传感。使用全矢量有限元法,在完美匹配层条件下对传感性能进行了分析,并研究了中央液晶孔、小气孔及普通气孔的大小对传感性能的影响。仿真结果表明,所设计的传感器在温度为15~50℃、折射率为1.48~1.55的检测范围内具有良好的温度和RI传感性能。Objective The dual-parameter detection of temperature and refractive index(RI)plays a crucial role in various fields,which provides comprehensive information for facilitating real-time monitoring and control of diverse processes,thereby enhancing efficiency,quality,and reliability,particularly in such areas as medical diagnosis,industrial manufacturing,and food safety.Researchers have explored the implementation of dual-parameter sensing for temperature and RI based on the Mach-Zehnder interferometer(MZI)principle,where multiple optical fibers are fused.Some have proposed the integration of MZI with tilted fiber Bragg gratings(TFBGs)for temperature and RI dual-parameter sensing.However,the relatively complex manufacturing and detection processes involved in these sensors pose challenges to practical production applications.Photonic crystal fiber(PCF)sensors feature real-time detection and strong interference resistance.By adjusting the periodic arrangement of air holes in the PCF,the RI distribution across the fiber’s cross-section can be modified to influence the fiber’s transmission characteristics.Different sensing functionalities can be achieved by filling the PCF with various advanced liquid materials.The surface plasmon resonance(SPR)phenomenon significantly enhances the sensitivity and detection range of PCF,among other sensing performances.We design a double-D-type SPR-PCF filled with liquid crystal E7 to enable dual-parameter sensing for temperature and RI.The double-D-type structure is designed to extend and further enhance the characteristics of the D-type structure,with a larger proportion of the fiber core close to the external environment for improving sensing performance.Methods The internal air holes of the PCF are arranged in a hexagonal pattern.The central large hole is filled with the temperature sensitive material liquid crystal E7 to form the fiber core.The upper and lower sides of the PCF are polished,and gold films deposited on the large open loops on both sides enable SPR external sens

关 键 词：传感器 光子晶体光纤 表面等离子体共振 双重检测传感器 双D型 液晶 

分 类 号：TN253[电子电信—物理电子学]